Milton Schwartz was an American who worked for Soviet Lilitary Intelligence GRU in during World War II. A decryption by the Army Signals Intelligence Corp in 1943 revealed Schwartz's activity on behalf of the GRU to be of such that value that a request to Moscow was put in for $1200 to assist Schwartz in personal financial matters.

Schwartz's code name with the GRU, and a decyphered by the Venona project is "Matvey".